Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62e167b44954db5…

MALICIOUS

PDF

66.5 KB Created: 2021-06-04 12:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 397035419863363215f82f08f07c5958 SHA-1: cec77db068e51aae66d4a54caa73bac9b15ecc50 SHA-256: a62e167b44954db5e739fc1ad57b5add590cb69322de3d06c092e0b4e3800756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/pbw?utm_term=what+is+the+average+salary+of+an+operations+manager PDF link annotation
    • https://rurajisikite.weebly.com/uploads/1/3/0/8/130813509/zosalanigiferi.pdfIn PDF document text
    • https://kapisodakogu.weebly.com/uploads/1/3/4/6/134697397/nikijudawutir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff75cc759b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5fe492ea876e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_604311338393a.pdfIn PDF document text
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/2735420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603e6433bb600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_602f22a2caa65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fc64cdec03c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_604d4c0f7879d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_605d957eb6325.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/249720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizunebapod.pbworks.com/f/corrugated_steel_roofing_sheets_price.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/mavufemomupuron.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144546234/persona_5_royal_satanael_magic_build.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144557460/how_to_connect_wireless_mouse_to_new_receiver.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144564291/60845090080.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144532083/50318752187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e065e4-be9e-4fc4-acf7-cd8cd1c8c420/nawukutelejeramesuni.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/tipinumavezud.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144604164/rixupesuxapukoxewedolem.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/w/file/fetch/144572469/hooked_inc_cheats_seagulls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef33854c-70bb-4133-a381-7460c2a30f86/sakinapawobesebexaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 5488 bytes
SHA-256: 92b6299f408603b4b6253057655b0bdde7bf9bfdb26347f678cbbeb6afb5d11c
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 9636 bytes
SHA-256: e97eacc824bfd20ae5564fedff0a5ddf92047dee63e9464de68781998f175d49